getting mobile geolocation on html5

Whats the most accurate techinique to get the geolocaiton of certain mobile phone using html5?? I need to get the phone GPS coordenates.

This will be used not for an application, but for certain website section where it will be able to report city's roads and paviment potholes attaching a picture and uploading it all.
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Your main source for html basics is here, in this case, about geolocation:

Please be aware, a browser will usually show a warning (if not granted already and saved), privacy sensitive people will have this turned off and renders these html5 functions based on geolocating useless.

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